I Error reporting scenario
This error occurs when using the El-select component of element-UI in Vue
Operation results: (the following errors will be reported when the interface is initially loaded, and will continue to be reported when clicking El-select and switching El-option)
[Vue warn]: Missing required prop: "value"
II Error reporting reason
2.1. There is no bidirectional data binding (V-model) in El-select
2.2 El-option does not assign value
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